Has a Lenovo part # on it, so I suspect this is the PCIe SSD inside the new ThinkPad X1 released as CES 2015, and there was a nice discussion on HN about it yesterday [1]. In that article, the author mentioned that in the tests "read speeds reached 1350 MB/s", which is pretty freaking awesome for a laptop!
Update: Yeah, the SM951 (shown in this article) is in the X1 [2 - see specifications heading].
Update: Yeah, the SM951 (shown in this article) is in the X1 [2 - see specifications heading].
[1] https://news.ycombinator.com/item?id=8847411
[2] http://www.thinkscopes.com/blog/2015/01/06/lenovo-thinkpad-x...